How to Lodge Your Tax Return in Australia and Maximise Your Refund (2026 Guide)

The Australian financial year runs 1 July to 30 June. Tax returns for 2024-25 can be lodged from 1 July 2025. The deadline for self-lodgement via myTax is 31 October 2025. If you use a registered tax agent, the deadline extends to 15 May 2026 - one of the main reasons to consider using an agent even if your return is relatively simple.

You must lodge a tax return if you received any income during the year - salary, business income, investments, rental income, or foreign income. You may not need to lodge if your only income was a government pension or allowance below the tax-free threshold and no tax was withheld - check the ATO's 'Do I need to lodge?' tool on ato.gov.au.

Work-related expenses are the most commonly missed deductions for Australian employees:

• Home office expenses: The Revised Fixed Rate method allows 67 cents per hour for every hour worked from home - covering electricity, internet, phone, and stationery. Keep a record of hours worked from home throughout the year (a diary or log). You can also claim additional expenses not covered by the rate (e.g., depreciation of work-specific equipment).
• Work-specific clothing, laundry, and dry cleaning: Compulsory uniforms, protective clothing, and occupation-specific clothing (e.g., a nurse's uniform, a chef's whites) are deductible - plus laundry costs. Generic business attire ('I wear it to work') is not deductible.
• Self-education expenses: If directly related to your current employment and maintaining or improving skills for your current job - course fees, textbooks, stationery, travel to classes. Note: courses for a new career are generally not deductible.
• Professional memberships and subscriptions: Professional association memberships, union fees, trade journals, and industry subscriptions directly related to your work are deductible.
• Tools and equipment: Items costing $300 or less are immediately deductible if used for work purposes. Items over $300 are depreciated over their effective life. Apportion if there's any private use.
• Work-related travel: Travel between work sites, to client meetings, or to conferences is deductible. Normal commuting (home to work) is not. Keep a logbook for vehicle use - the cents-per-kilometre method (88c/km for 2024-25, capped at 5,000km) is simplest for moderate travel.

Investment income creates deduction opportunities most Australians don't fully use:

• Investment property: All genuine costs of managing an investment property are deductible - interest on the loan, rates, insurance, agent fees, repairs, and depreciation on fixtures and fittings (requires a quantity surveyor's depreciation schedule). Negative gearing losses reduce your taxable income from other sources.
• Shares and managed funds: Interest on loans to purchase shares, investment management fees, and some advice fees related to taxable investments are deductible. Brokerage on purchase is not immediately deductible - it's added to your cost base for CGT calculation.
• Superannuation: Personal contributions for which you claim a deduction (after lodging a 'notice of intent to claim' with your super fund) are deductible. This is how self-employed people get the concessional 15% super tax treatment.
• Tax agent fees: The fee you paid your accountant or tax agent for last year's return is deductible this year.

The ATO applies a clear test to every deduction claim:

• You must have spent the money yourself (not reimbursed by your employer).
• The expense must be directly related to earning your income (not private or domestic).
• You must have a record (receipt, invoice, bank statement, or diary entry for travel/hours).

The ATO uses data matching and benchmarks to identify returns that warrant scrutiny:

• The ATO benchmarks deductions by occupation: A mechanic who claims $15,000 in work expenses when the industry average is $2,000 will attract attention. Claims should be genuine, documented, and proportionate to your income and occupation.
• Record keeping is your protection: You don't need to submit receipts with your return - but you must be able to produce them if asked. The ATO has 2 years to review most returns (5 years for complex or fraud-related matters).
• Don't inflate or invent deductions: The ATO has data-matching arrangements with thousands of organisations. Bank transactions, PAYG summaries, health funds, and government agencies all cross-check. Invented deductions are detectable.
• Rental property deductions are heavily scrutinised: Initial repairs on a recently purchased property are not deductible (they're capital improvements). The ATO actively reviews investment property claims.
• Work-from-home claims: After a significant increase in WFH claims post-2020, the ATO tightened requirements. You must maintain contemporaneous records of hours worked from home - the previous '4-week representative period' approach is no longer accepted.

myTax (via myGov) is the ATO's free online lodgement tool. It pre-fills information from employers, banks, government agencies, and health funds. For straightforward returns (salary or wages only, simple deductions, no rental property or business income), myTax is adequate and free.

A registered tax agent adds value when: you have investment properties (complex depreciation, negative gearing); you're self-employed or have business income; you have capital gains to calculate; you have foreign income; or you're simply unsure whether you're claiming everything you're entitled to. The average registered tax agent fee ($150–$400 for most individual returns) is often recovered through additional deductions found. And the agent's fee itself is deductible next year.

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